关键词: 接触性溶蚀, 电导率, 钙离子浓度, 矿化度, 矿渣水泥

Abstract: The soluble components in cement-based material could be dissolved by deionized water, which can change the microstructure of the cement-based material and then affect its durability. Laboratory experiment was conducted to study the contact corrosion of cement-based material with different contents of slag in deionized water. Through experimental data, the electrical conductivity and the maximum values in each period were obtained, and the TDS of corrosion solution at different time were predicted. Then through the relationship between calcium concentration and electrical conductivity, the dissolved calcium quantity in the future period was derived. Combining with the mathematical equation of calcium concentration, electrical conductivity and TDS of corrosion solution, it shows that the higher the content of slag in cement-based specimen, the stronger resistance to surface contact corrosion under low water-solid ratio.

Key words: contact corrosion, electrical conductivity；calcium concentration；TDS, slag cement